The bellows move, but the CPU stays quiet — what’s powering this browser based harmonium?

The bellows move, but the CPU stays quiet — what’s powering this browser web harmonium ? Clicking into this harmonium-in-a-tab feels a bit surreal: a little bellow handle animates, reeds respond to keypresses, and the sound is surprisingly organic for something coming out of AudioContext . I'm less interested in how musical it feels than in how they pulled off that “real instrument in a browser” illusion with so little lag. Probably sample playback, not synthesis The page claims “nine sampling p